1. Introduction 2. IT Sustainability: Definition, Standards & Measurements 3. IT Sustainability and Innovations in Data Center Technologies 4. ICT Transitioning to Renewable and Clean Energy Sources 5. Energy efficient High-Performance Computing: Liquid Cooling 6. Public Cloud: Sustainability as a Driver of Cloud Technology Innovations 7. Circular Economy and Sustainable IT 8. Remanufactured IT Equipment 9. 5G/6G and IT Sustainability and Innovations in Data Center Technologies 10. IoT and Energy Savings 11. The Environmental Implications of Remote Working 12. Cryptocurrency and Its Impact of the Environment 13. Adiabatic Reversible Computing 14. Quantum Computing Contributes to Achieving Sustainable IT 15. Conclusion